Device foe deop hammees



(No Model.) W. S. WARD.

LIPTING DEVICE FOR DROP HAMMERS. N0.-357-,433. Patented Feb; 8, 1887.

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" T i i rcn.

WILLIAM S. WARD, OF PLANTSVILLE, CONNECTICUT, ASSIGNOR TO 1). SMITH & 00., OF SAME PLACE.

LIFTING DEVlCEFOR DROP-HAMMEES.

SPECIFICATION forming part of Letters Patent No. 357,433, dated February 8, 1887.

Application filed November 23, 1886. Serial No. 219,606. (No model.)

.To all whom it may concern;

Be it known that 1, WILLIAM S. WARD, of Plantsville, in the county of Hartford and State of Connecticut. have invented a new Improve- 5 ment in Drop-Lifters; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said r drawings constitute part of this specification,

and represent, in-

Figure 1, a side view of the lifter-frame and lifting mechanism; Fig. 2, a top or plan view of the same; Fig 3, arear or end view looking I toward the cylinder E.

This invention relates to an improvement in mechanism for lifting the hammer in a drop for forging and like purposes, and in. which the lifting is produced by pressure of two revolving cylinders upon the hammer strap or bar. In the now general construction of this class of'drops a rigid bar extends up from the hammer, between two revolving cylinders, the cylinders being driven in a lifting direction,

2 5 so that when the cylinders are pressed toward each other, so as to come to a hard bearing upon opposite surfaces of the bar, the revolving motion of the cylinders draws the bar and the hammer upward, until, at the proper elevation, the cylinders are separated, so as to leave the bar free, and the hammer will drop.

Then the cylinders, again brought together upon the bar, raise it a second time, until released as before, and so continuing successive blows of the hammer are imparted.

My invention relates specially to the mechanism for operating the movable cylinder to grasp or release the bar, it being understood that usually one of the cylinders revolves upon a stationary axis, while the axis of the other cylinder is moved toward or from the cylinder having the fixed axis, as the case may be; and the invention consists in a pair of toggles, one end of one link of each toggle fixed to the axis or hearing which carries the movable cylinder, the opposite end of the other link fixed to the frame, so that turning the links into astraight line forces the movable cylinder toward the other cylinder, or turning the toggles out of so the straight line withdraws the cylinder.

In illustrating the invention I do not show the hammer and the mechanism below, as that constitutes no part of the invention.

A represents the uprights, upon which a lifter-frame, B, is arranged. The hammer-is arranged between the uprights and guided thereby in the usual manner. In the lifterframe, in fixed bearings, the principal drivingshaft C is arranged, and on this shaft is one cylinder, D.

E represents the second cylinder, and between the two cylinders D E the hammer strap or barF extends upward. The shaft G of the cylinder E is supported in bearings H, which bearings rest in longitudinal seats J in the, frame, and so as to be movable therein toward and from the cylinder D. The two cylinders are each provided with a like gear, K, which causes them to revolve in opposite directions, the direction of revolution being indicated by 79 arrows in Fig. 1. Power is imparted to the shaft 0 of the cylinder D by pulleys L, or otherwise.

At'one end of the cylinder E one link, M, of a toggle is hung upon the shaft G, as seen in Fig. 2. N represents the second link of this toggle, one end hinged to the free end of the link M, as at a, the other end ofthe linkN hung upon a fixed bearing to the frame, as here represented upon a shaft, 0, supported in 80 bearings P on the frame. At the opposite end of the cylinder Eis alike toggle, composedof two links. H S, the link It being hung to the shaft G of the cylinder E. The opposite end of the link E is hung upon a fixed bearing in the frame, (here represented as fixed to the shaft 0,) the adjacent ends of the two links hinged together by a pintle, b. The toggles at the respective ends of the cylinder correspond to each other, and'so that when standing in 0 the extended position, as seen in Fig. 1, the bearing H, carrying the shaft G, is forced toward the cylinderD; but when the toggles are turned out of their extended position, as indicated in broken lines, Fig. 1, then the bearing 5 H is drawn backward to move the shaft G and the cylinder it carries from the cylinder D.

To thejoint,between one of the toggles-say E S-a rod, T, is hung,which extends downward, and by means of which the toggles are turned I00 to extend or contract them, as the case may be. This rod T is Substantially the same as the rod usually employed in drop-lifters for applying and removing the lifting force, not necessary to be particularly described, further than to show its connection with the toggle. As the rod T is raised, by hand or otherwise, it turns thejoint between the toggles upward out of line to theircontraetcd position, or when drawn downward it turns the toggles into line and into their extended position, as indicated in Fig. 1. Vhen the toggles are in their ex tended position, the cylinder E is forced so far toward the cylinder D as to grasp the bar F between the two cylinders, that the frictional contact between the said two cylinders and the opposite surface of the said bar may cause the bar, with the hammer it carries, to rise. Then, upon the toggles being turned into the contracted position, the cylinder E is withdrawn from contact with the bar F, leaving the said bar, with the hammer, free to fail.

Preferably I make the bearings U, which carry the shaft 0, adj nstablesay by means of set-screws \Y-in order that the cylinder D may be adjusted to varying thicknesses of the hammer strap orbar. By this construction but a very slight movement of the rod T or joint of the toggles is necessary to impart the clamping and releasing movement to the cylinder E, much less than where an eccentric shaft is employed, as in some lifters.

By attaching the links N S of the respective toggles to the same shaft 0 the movement imparted to one toggle is transmitted to the other through the shaft 0; but instead of thus communicating the movement from one toggle through the shaft to the other the two toggles may be connected to the same rod T, as indicatedin broken lines, Fig. 3.

I claim The herein-described improvement in droplifters, consisting in the combination of a frame, revolving cylinder D, arranged upon a shaftsupported in said frame, a second cylinder, E, arranged upon a shaft supported in bearings movable toward and from the said cylinder D, a pair of toggles at each end of said cylinder E, one link of each pair hung upon the axis ofthe said cylinder, the other link of each pair hung upon a fixed bearing in the frame, and a rod extending from the joint of the said toggles,substantiall y as described, and whereby, throughthe said rod, thesaid toggles may be extended or contracted to correspondingly force the said cylinder E toward or from the cylinder D.

VM. S. VARD.

Witnesses:

E. P. HOTCHKISS, E. W. MIcHELL. 

